Device for screwing nuts

Abstract

The utility model relates to the field of wrenches for fastening, connecting, detaching or clamping, in particular to a device for screwing a nut. The device for screwing the nut comprises a shell, the lower end of the shell is open and provided with at least two layers of nut sleeves, the nut sleeves are mutually nested together and movably matched in the vertical direction, the upper end of each nut sleeve is connected with more than two tail rods, and a guide seat is further arranged in the shell. The tail rods are matched with the guide seat in a guiding mode in the vertical direction, a lead screw seat is further arranged on the portion, above the guide seat, of the shell, lead screws corresponding to the tail rods are installed on the lead screw seat, vertical screw holes are formed in the tail rods, the lead screws are matched with the corresponding screw holes, and the lead screws are matched with the corresponding screw holes. The lead screws corresponding to the tail rods connected to the same nut sleeve are in synchronous transmission connection through flexible transmission devices, and the flexible transmission devices are staggered in the vertical direction. The tensioning device solves the problem that an existing tensioning device is poor in adaptability to nuts of different specifications.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of spanner for fastening, connecting, disassembling or clamping, in particular to a device for screwing nuts. BACKGROUND

[0002] In the field of construction engineering, bolts, such as prestressed anchor rods and high-strength bolts, are increasingly directly applied with prestress. When prestress is applied to the bolt, the nut on the bolt needs to be screwed to enable the bolt to maintain a certain prestress. As a common sense, the nut is usually screwed with a spanner, and a socket spanner is the most common type of spanner, but the common socket spanner is a "dead mouth" spanner, that is, the inner hole size of the socket is fixed, and when different specifications of nuts need to be operated, the operator needs to carry multiple specifications of socket spanners, which obviously brings great inconvenience to the operator.

[0003] In order to solve the problem that the socket spanner cannot be applied to nuts of different specifications, a socket spanner is disclosed in the Chinese Utility Model Patent with the authorization announcement number CN211761096U and the authorization announcement date October 27, 2020. The socket spanner includes a shell, the shell is cylindrical, an outer socket is fixedly installed at one end of the shell, an inner socket axially movable relative to the outer socket is arranged in the outer socket, a screw rod is connected to the upper end of the inner socket, the screw rod is provided with an adjusting nut, a gear ring is installed outside the adjusting nut, a gear meshing with the gear ring is arranged on the shell, the inner socket can be lifted and lowered by rotating the adjusting nut with the gear, so as to correspondingly leave and occupy the inner hole of the outer socket. When a larger nut needs to be operated, the inner socket can be moved upward by rotating the adjusting nut to leave the inner hole of the outer socket, and the inner hole of the outer socket cooperates with the nut to be operated; when a smaller nut needs to be operated, the inner socket can be moved downward into the outer socket by rotating the adjusting nut, and the inner hole of the inner socket cooperates with the nut to be operated.

[0004] Although the above-mentioned socket spanner realizes the screwing operation of nuts of different specifications, since the inner socket is moved by the screw rod coaxially arranged therewith, the screw rod occupies the central position of the top of the socket, which limits the number of screw rods to one, so that only two specifications of sockets can be configured, and further expansion is not possible. When more specifications of sockets are needed for operation in the application scenario, multiple socket spanners still need to be provided to meet the use requirements. Therefore, the above-mentioned socket spanner still has the problem of poor universality. In terms of the demand for bolt prestress tensioning, the device for screwing nuts with the socket spanner as the core component has the problem of poor adaptability and cannot operate different specifications of bolts, so multiple different tensioners need to be purchased when different specifications of bolts need to be operated, which is high in cost and not easy to carry. The utility model discloses a device for screwing nut

[0005] The utility model discloses a device for screwing nut to solve the poor adaptability of the existing tensioning device to different specifications of nut.

[0006] In order to solve the above problem, the device for screwing nut of the utility model adopts the following technical scheme: the device for screwing nut, including the shell, the lower end of the shell is open and is provided with at least two layers of nut sleeve at the open, the nut sleeve is nested together and is movably matched along the up-down direction, two or more tail rods are connected on the upper end of each nut sleeve, a guide seat is further arranged in the shell, and each tail rod is guided and matched with the guide seat along the up-down direction, a screw rod seat is further arranged above the guide seat on the shell, a screw rod corresponding to each tail rod is installed on the screw rod seat, a vertical screw hole is arranged on the tail rod, the screw rod is matched with the corresponding screw hole, the screw rods corresponding to each tail rod connected on the same nut sleeve are synchronously connected through flexible transmission devices, and the flexible transmission devices corresponding to each nut sleeve are staggered in the up-down direction to avoid mutual interference.

[0007] Furthermore, one of the screw rods connected with each nut sleeve is synchronously connected with a motor, and a switch button corresponding to each motor is arranged on the shell.

[0008] Furthermore, a proximity sensor corresponding to each nut sleeve is arranged on the upper side of the nut sleeve or the lower side of the guide seat, and the proximity sensor is connected with a corresponding indicator lamp, and each indicator lamp is used for indicating the position of the corresponding nut sleeve.

[0009] Furthermore, a top plate is arranged on the upper end of the shell, and the switch button and the indicator lamp are arranged on the top plate.

[0010] Furthermore, a plug rod hole for inserting an operating rod is arranged on the cylinder wall in the circumferential direction of the nut sleeve, and an operating port is arranged on the shell corresponding to the plug rod hole.

[0011] Furthermore, the flexible transmission device is a synchronous belt transmission device, and the synchronous belt transmission device comprises a gear arranged on the corresponding screw rod and a synchronous belt arranged on the corresponding gear.

[0012] Furthermore, the nut sleeve is a polygonal sleeve.

[0013] Furthermore, the tail rods of the nut sleeve are arranged on the opposite two sides of the nut sleeve.

[0014] Furthermore, the tail rod and the guide seat are rotationally matched in the circumferential direction.

[0015] Further, the tail rod is rectangular in cross section.

[0016] Further, the guide seat is composed of a circular seat plate fixed in the shell, which is fixedly connected with the inner wall of the shell.

[0017] Beneficial effects: the device for screwing nuts of the utility model is an improved utility model creation. Specifically, the utility model sets two or more tail rods on each nut sleeve nested with each other, drives the circumferential different positions of the nut sleeve through at least two screw rods connected synchronously through the flexible transmission device, and sets the mechanism for driving the nut sleeve to ascend and descend in the center periphery of the nut sleeve. Therefore, the device for screwing nuts of the utility model can be equipped with driving mechanisms for multiple nut sleeves by virtue of the characteristics of the sufficient space around the nut sleeve, the flexible transmission device is arranged in the up-down direction and does not interfere with each other, and the driving of any one nut sleeve can be realized independently. The space in the up-down direction is also relatively sufficient. The above makes the number of nut sleeves of the device for screwing nuts of the utility model as many as possible according to the needs, compared with the structure that only two layers of nut sleeves can be arranged in the prior art, the utility model solves the problem of poor adaptability to different specifications of nuts existing in the existing tensioning device. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a use schematic view of an embodiment of the device for screwing nuts of the utility model;

[0019] Figure 2 is Figure 1 the perspective view of the device for screwing nuts in the utility model;

[0020] Figure 3 is Figure 2 the internal structure schematic view of the device for screwing nuts in the utility model;

[0021] Figure 4 is Figure 3 the mounting structure schematic view of the outer sleeve in the utility model;

[0022] Figure 5 is Figure 3 the mounting structure schematic view of the middle sleeve in the utility model;

[0023] Figure 6 is Figure 3 the mounting structure schematic view of the inner sleeve in the utility model;

[0024] Figure 7 is Figure 3 the structure schematic view of the outer, middle and inner sleeves in the utility model;

[0025] Figure 8 isFigure 3 Structure diagram of the guide seat in the device.

[0026] In the figure: 101, bolt; 102, nut; 103, operation port; 1, shell; 2, guide seat; 3, outer sleeve; 4, outer sleeve tail rod; 5, outer sleeve screw rod; 6, outer sleeve motor; 7, outer sleeve synchronous belt; 8, middle sleeve; 9, middle sleeve tail rod; 10, middle sleeve screw rod; 11, middle sleeve motor; 12, middle sleeve synchronous belt; 13, inner sleeve; 14, inner sleeve tail rod; 15, inner sleeve screw rod; 16, inner sleeve motor; 17, inner sleeve synchronous belt; 18, outer sleeve metal block; 19, middle sleeve metal block; 20, inner sleeve metal block; 21, plug rod hole; 22, inner sleeve proximity switch; 23, middle sleeve proximity switch; 24, outer sleeve proximity switch; 25, outer sleeve motor switch; 26, middle sleeve motor switch; 27, inner sleeve motor switch; 28, inner sleeve indicator light; 29, middle sleeve indicator light; 30, outer sleeve indicator light; 31, controller. DETAILED DESCRIPTION

[0027] The features and performances of the present application are further described in detail below in combination with embodiments.

[0028] As Figure 1 shown, the device for screwing nuts is used for cooperating with the nut 102 of the bolt 101, applying torque to the nut 102 to drive the nut 102 of the bolt 101 to rotate, and then keeping the bolt 101 at a certain prestress. The present application sets the nut sleeve cooperating with the nut 102 of the bolt 101 as a multi-layer nested structure and can be relatively lifted, and the lifting drive mechanism of each nut sleeve is arranged at the end center periphery, so as to fully utilize the relatively sufficient space in the circumference, more lifting drive mechanisms can be arranged, and then the expansion of the number of nut sleeves is realized, so that the device for screwing nuts of the present application is suitable for the operation of more different specifications (sizes) of nuts 102.

[0029] Based on the above utility model concept, the utility model provides a basic implementation mode as follows: in the basic implementation mode, the device for screwing nut of the utility model includes shell 1, the lower end of shell 1 is open and is provided with at least two layers of nut sleeve at the open end, each layer of nut sleeve is nested together and is movably matched along the up-down direction, the lower end of shell 1 is designed as open structure to enable the nut 102 operated in use to enter into shell 1 and be matched with nut sleeve, in other words, it can be clamped by nut sleeve to exert torque on it. At least two layers of nut sleeve are provided and each layer of nut sleeve is nested together, and the nut sleeve and the adjacent nut sleeve are also movably matched along the up-down direction, so that different nut sleeves are enabled when different specifications of nut 102 are encountered, thereby realizing the adaptability to different specifications of nut, so it is known that the number of nut sleeve can be three, four or two in the face of different application scenarios. In order to realize the above-mentioned movable matching, each nut sleeve adopts an equal-diameter sleeve, which is open at both ends, and the inner hole is a polygonal hole, of course, the inner hole of the nut sleeve is designed as a polygonal hole to be matched with the corresponding nut 102. In Figures 3-7 In the embodiment shown, the number of nut sleeves is designed as three, and the three nut sleeves are outer sleeve 3, middle sleeve 8 and inner sleeve 13 from outside to inside.

[0030] In order to integrate and keep each nut sleeve in shell 1 for convenient carrying and use, a guide seat 2 is arranged in shell 1, and a tail rod that is guided and matched with guide seat 1 is arranged on the upper end of each nut sleeve, the tail rod extends along the up-down direction, in order to ensure a certain stability, the number of tail rods should be more than two and be distributed along the circumference of the nut sleeve. In Figures 2-7 In the embodiment shown, the tail rod corresponding to the outer sleeve is outer sleeve tail rod 4, the tail rod corresponding to the middle sleeve is middle sleeve tail rod 9, and the tail rod corresponding to the inner sleeve is inner sleeve tail rod 14, in the process of use, if the tail rod moves up and down, the nut sleeve where the tail rod is located can move up and down synchronously. In order to adjust the up-down position of each nut sleeve, make it move upward away from the inner and outer nut sleeves, or move downward to the working position to be matched with the corresponding nut 102, a vertical threaded hole is arranged on each tail rod and a lead screw is installed in the threaded hole, wherein the lead screw matched with outer sleeve tail rod 4 is outer sleeve lead screw 5, the lead screw matched with middle sleeve tail rod 9 is middle sleeve lead screw 10, and the lead screw matched with inner sleeve tail rod 14 is inner sleeve lead screw 15, the upper end of the lead screw is connected to shell 1 through the lead screw seat (omitted in the figure) arranged on shell 1, and a lead screw nut mechanism is formed between the lead screw and the corresponding tail rod, so that the height position of the corresponding nut sleeve can be adjusted by rotating the lead screw.

[0031] Since the number of lead screws connected to the same nut sleeve is not one, the synchronous rotation of each lead screw needs to be ensured to avoid the smooth up and down movement of the nut sleeve, therefore, flexible transmission devices are arranged between each lead screw connected to the same nut sleeve, in order to avoid interference between the flexible transmission devices corresponding to different nut sleeves, the flexible transmission devices corresponding to each nut sleeve are arranged at different height positions, so as to fully utilize the circumferential space of the nut sleeve and the axial, i.e. up and down, space of the sleeve nut, so the number of nut sleeves can be greatly expanded according to actual needs.

[0032] In the above embodiment, when using the device for screwing nuts, the nut sleeves that are not needed can be lifted by driving the corresponding lead screw to rotate as needed, leaving the nut sleeves that are needed, and the screwing operation of the corresponding nut is realized through the nut socket, i.e. the inner hole, of the remaining nut sleeve and the corresponding nut 102.

[0033] Based on the above basic embodiment, as shown in Figures 3-6 one of the lead screws connected to each nut sleeve is driven by a motor (here, a servo motor), among which the motor corresponding to the outer sleeve 3 is the outer sleeve motor 6, the motor corresponding to the middle sleeve 8 is the middle sleeve motor 11, and the motor corresponding to the inner sleeve 13 is the inner sleeve motor 16. The switches corresponding to each motor are arranged on the shell 1, as shown in Figure 2 , among which the switch corresponding to the outer sleeve motor 6 is the outer sleeve motor switch 25, the switch corresponding to the middle sleeve motor 11 is the middle sleeve motor switch 26, and the switch corresponding to the inner sleeve motor 16 is the inner sleeve motor switch 27. By arranging the motor and setting the switch of the motor on the shell 1, the operator can control the forward and reverse rotation of the corresponding motor as needed during use, thereby controlling the up and down position of the corresponding nut sleeve, realizing the selection of the required nut sleeve, and having the effects of convenience and speed. Of course, in some embodiments, the operation mode of the lead screw can also be manual operation, in which case only the upper end of the lead screw is exposed, and the exposed end of the lead screw is manually operated. In order to facilitate operation, a hand wheel or the like can also be arranged on the exposed end of the lead screw. Although manual operation of the lead screw is relatively low in efficiency, it can still adjust the position of the nut sleeve and select the nut sleeve.

[0034] Based on the above embodiment, further, as shown in Figure 8 , a proximity switch is arranged on the lower side of the guide seat 2, which is specifically an inductive proximity switch, and the number of proximity switches corresponds to the number of nut sleeves, which are respectively the outer sleeve proximity switch 24, the middle sleeve proximity switch 23 and the inner sleeve proximity switch 22, as shown in Figure 7As shown, the outer sleeve metal block 18, the middle sleeve metal block 19 and the inner sleeve metal block 20 corresponding to the above switches are arranged on the outer sleeve 3, the middle sleeve 8 and the inner sleeve 13 respectively, and the outer sleeve indicating lamp 30, the middle sleeve indicating lamp 29 and the inner sleeve indicating lamp 28 corresponding to the outer sleeve proximity switch 24, the middle sleeve proximity switch 23 and the inner sleeve proximity switch 22 are arranged on the shell 1 respectively, wherein the outer sleeve proximity switch 24, the middle sleeve proximity switch 23 and the inner sleeve proximity switch 22 are connected to the same controller 31 as the outer sleeve indicating lamp 30, the middle sleeve indicating lamp 29 and the inner sleeve indicating lamp 28. When the corresponding switch is pressed and the corresponding nut sleeve is raised to the position, the corresponding indicating lamp is lit, which can prompt the operator to turn off the motor at this time. Of course, in some other embodiments, the above-mentioned proximity switch and indicating lamp can also be omitted, in which case the operator can rely on experience and observation to judge the position of the corresponding nut sleeve and further judge whether it is in place.

[0035] In the above-mentioned embodiments, the proximity switch is arranged on the lower side of the guide seat 2, however, those skilled in the art should understand that in some embodiments, it is also feasible to arrange the proximity switch on the upper side of the corresponding nut sleeve, which should be within the ability of those skilled in the art, therefore, it will not be described here.

[0036] On the basis of the above-mentioned embodiments, as a further optimization, a top plate is arranged on the shell 1, and the above-mentioned switches and indicating lamps are arranged on the top plate, which can further facilitate observation and operation; of course, in some other embodiments, the switch button and the indicating lamp can also be arranged on the circumferential side wall of the shell, which can also achieve the effect of meeting the operation and observation requirements.

[0037] In addition, as a preferred embodiment, as shown in the drawings, Figures 3-6 As shown, the nut sleeve is provided with a plug rod hole 21 for inserting the operating rod around the circumferential wall, as shown in the drawings, Figures 2-6 As shown, the operating port 103 is arranged on the shell 1 corresponding to the plug rod hole, which is to facilitate the insertion of the operating rod as a force rod during use to provide the required torque for screwing the nut 102; in addition, by using this structure, the torque is directly applied to the nut sleeve, which can greatly reduce the strength requirements of the shell 1, the tail rod and other components, thereby reducing the material usage and weight, making the device for screwing the nut of the utility model more portable. Of course, in some other embodiments, the operating torque can also be transmitted to the corresponding nut sleeve through the shell 1, the guide seat 2 and the tail rod in turn, which although can increase the strength requirements of the above-mentioned components and increase the material usage, but it can still solve the poor adaptability problem of the existing tensioning device proposed by the utility model.

[0038] In a preferred embodiment, the flexible transmission device described above adopts a synchronous belt transmission device, which comprises gears arranged on corresponding lead screws and a synchronous belt arranged around the gears. Figures 3-6 In the embodiment shown, the number of tail rods on each nut sleeve is two, and the number of corresponding lead screws is also two, so the number of gears of the synchronous belt transmission device is two, and the two gears are arranged on the two lead screws (manufactured integrally or separately and then assembled), and the synchronous belt cooperates with the two gears. The two gears corresponding to the outer sleeve are the outer sleeve gears, and the synchronous belt is the outer sleeve synchronous belt 7. The two gears corresponding to the middle sleeve are the middle sleeve gears, and the synchronous belt is the middle sleeve synchronous belt 12. The two gears corresponding to the inner sleeve are the inner sleeve gears, and the synchronous belt is the inner sleeve synchronous belt 17. Although the synchronous belt transmission device is adopted as the flexible transmission device in the above embodiment, it should be understood by those skilled in the art that in other embodiments, the flexible transmission device can also adopt a chain transmission device or the like. The adoption of the flexible transmission device has the advantage that the mutual interference between different transmission devices can be conveniently avoided.

[0039] Based on the preferred embodiment described above, further, Figures 3-6 In the embodiment shown, the nut sleeve is a polygonal sleeve, specifically a regular polygonal sleeve, and more specifically a regular hexagonal sleeve, and the tail rods of the nut sleeve are arranged on opposite sides of the nut sleeve. The cross section of the tail rod is rectangular, and the tail rod is rotationally stopped in the circumferential direction with the guide seat 2. It should be noted here that in some embodiments, the nut sleeve only needs to ensure that the cross section of the inner hole thereof is polygonal, and the shape of the outer periphery should not be limited. In addition, since the tail rod is fixedly connected with the corresponding nut sleeve, and each nut sleeve is connected with two tail rods, the tail rod cannot rotate regardless of the shape of the cross section of the tail rod.

[0040] When the device for screwing nuts of the utility model is used, the size of the nut is adjusted, when the outer sleeve 3 is needed, the middle sleeve motor 11 and the inner sleeve motor 16 are started through the middle sleeve motor switch 26 and the inner sleeve motor switch 27, the corresponding middle sleeve lead screw 10 is driven to rotate by the middle sleeve motor 11, and the two middle sleeve lead screws 10 are rotated under the cooperation of the two middle sleeve gears and the middle sleeve synchronous belt 12, and the two middle sleeve tail rods 9 drive the middle sleeve 8 to move upwards and separate from the outer sleeve 3 under the action of the thread, and the middle sleeve tail rod 19 moves upwards when the middle sleeve 8 moves, so when the middle sleeve 8 moves to the appropriate position, the middle sleeve proximity switch 23 detects the middle sleeve metal block 19, the detection information is transmitted to the controller 31, and then the middle sleeve indicator light 29 is lit through the controller 31, at this time, the user can close the middle sleeve motor 11 through the middle sleeve motor switch 26.

[0041] As above, the operator can also move the inner sleeve 13 upward to a suitable position, then set the outer sleeve 3 on the nut, and then rotate and tighten the outer sleeve 3 by inserting a special tool into the insertion hole 21 through the operation opening 103 on the shell 1, thereby completing the tensioning action.

[0042] Based on the above method, the position of the nut sleeve can be adjusted, and then a suitable nut sleeve can be selected according to needs, so that the structure is simple, multiple nut sleeves are integrated, and thus the corresponding suitable nut sleeve can be adjusted and selected according to the size of the nut, thereby saving cost and facilitating carrying.

[0043] The above is only a preferred embodiment of the present application, and is not used to limit the present application. The patent protection scope of the present application is subject to the claims, and any equivalent structural changes made by applying the contents of the specification and drawings should also be included in the protection scope of the present application.

Claims

1. A device for screwing nuts, comprising a housing, the lower end of which is open and at which at least two layers of nut sleeves are provided, which are nested one inside the other and are in sliding engagement in the up-down direction, characterized in that, Two or more tail rods are connected to the upper end of each nut sleeve, and a guide seat is arranged in the shell. Each tail rod is guided in the up-down direction by the guide seat. A screw rod seat is arranged above the guide seat on the shell. A screw rod corresponding to each tail rod is arranged on the screw rod seat. A vertical screw hole is arranged on the tail rod. The screw rod is matched with the corresponding screw hole. The screw rods corresponding to the tail rods connected to the same nut sleeve are connected by flexible transmission devices. The flexible transmission devices corresponding to each nut sleeve are staggered in the up-down direction to avoid interference. Each nut sleeve can move upward under the drive of the corresponding screw rod to leave the nut socket of the adjacent nut sleeve.

2. A device for screwing nuts according to claim 1, characterized in that, A motor is connected to one of the screw rods of each nut sleeve. A switch button corresponding to each motor is arranged on the shell.

3. A device for screwing nuts according to claim 2, characterized in that, A proximity sensor corresponding to each nut sleeve is arranged on the upper side of the nut sleeve or the lower side of the guide seat. The proximity sensor is connected to a corresponding indicator light. Each indicator light is used to indicate the position of the corresponding nut sleeve.

4. A device for screwing nuts according to claim 2 or 3, characterized in that, A top plate is arranged at the upper end of the shell. The switch button and the indicator light are arranged on the top plate.

5. A device for screwing nuts according to any one of claims 1-3, characterized in that, A plug rod hole for inserting an operating rod is arranged on the cylindrical wall of the nut sleeve in the circumferential direction. An operating port is arranged on the shell corresponding to the plug rod hole.

6. A device for screwing nuts according to claim 1, characterized in that, The flexible transmission device is a synchronous belt transmission device. The synchronous belt transmission device includes a gear arranged on the corresponding screw rod and a synchronous belt arranged on the corresponding gear.

7. A device for screwing nuts according to claim 1, characterized in that, The nut sleeve is a polygonal sleeve.

8. A device for screwing nuts according to claim 6, characterized in that, The tail rods of the nut sleeve are arranged on opposite sides of the nut sleeve.

9. The device for screwing nuts according to claim 1, characterized in that, The tail rod and the guide seat are rotationally matched in the circumferential direction.

10. A device for screwing nuts according to claim 8, characterized in that, The cross section of the tail rod is rectangular.

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