Nut tightening device

Abstract

This application provides a nut tightening device, comprising: a first mounting plate, which is liftable; a first guide rail assembly, including a first guide rail fixed to the first mounting plate and a first slider disposed on the first guide rail; a working member, which is connected and fixed to the first slider; a first elastic member, which can apply a force to the first slider in the opposite direction to the movement of the first slider; a driving member, which is connected and fixed to the first mounting plate and configured to drive the first slider to move; and a second elastic member, which is configured to abut against the driving member or the first slider, so as to apply a reverse force to the driving member or the first slider when the driving member drives the first slider to move in a first direction. This application can improve the nut installation efficiency while reducing the damage rate of nuts and bolts.

Description

Technical Field

[0001] This invention relates to the field of industrial automation, and more specifically to a nut tightening device. Background Technology

[0002] In traditional automotive wiring harness installation, the wiring harness and locking screws are separate. With advancements in industrial production, some critical wiring harnesses now have locking screws pre-installed on them. This eliminates the need to prepare screws separately when installing the harness into the vehicle, reducing the number of parts and material management costs for the OEM. Screws can easily detach after being installed on the wiring harness. To prevent this, a nut is installed on the screw to prevent it from falling off during transport. Traditionally, to improve nut installation efficiency, a cylinder is used to move a screwdriver to the desired nut position, automatically installing the nut onto the bolt. However, this method is prone to damaging nuts or bolts that are small or made of soft materials. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this invention provides a nut tightening device that can balance the force during nut installation, thereby improving nut installation efficiency while reducing the damage rate of nuts and bolts.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] This invention discloses a nut tightening device, comprising:

[0006] First mounting plate, the first mounting plate is liftable;

[0007] The first guide rail assembly includes a first guide rail fixed to the first mounting plate and a first slider disposed on the first guide rail;

[0008] The working part is connected and fixed to the first slider;

[0009] The first elastic element can apply a force to the first slider that is opposite to the direction of movement of the first slider;

[0010] A driving component, which is connected and fixed to the first mounting plate and configured to drive the first slider to move;

[0011] A second elastic element is configured to abut against the driving element or the first slider, so that when the driving element drives the first slider to move in a first direction, a reverse force can be applied to the driving element or the first slider.

[0012] In the above technical solution, when the nut moves onto the bolt, the first elastic element can buffer the working part, balance the pressure of the working part's own weight on the nut pressing against the bolt, prevent the nut from being damaged when the working part descends, and make pre-positioning for subsequent tightening of the nut. When tightening the nut, the second elastic element can apply a reaction force to the driving part to balance the pressure during the tightening process of the nut, thereby avoiding the nut being damaged by excessive compression.

[0013] Furthermore, it also includes a base, on which a lifting cylinder is provided. The lifting cylinder can move along the length of the base. The first mounting plate is connected to the lifting cylinder, and the lifting cylinder can drive the first mounting plate to descend in a first direction. This allows the workpiece to be moved to the position where the nut is to be picked up and the position where the nut is to be tightened.

[0014] Furthermore, it also includes a second guide rail assembly, which includes a second guide rail fixed to the base, a second slider disposed on the second guide rail, a drive motor for driving the second slider to move along the second guide rail, and a second mounting plate connected to the second slider. The lifting cylinder is fixedly connected to the second mounting plate. This allows the workpiece to be moved from the position where the nut is to be picked up to the position where the nut is to be tightened. The structure is simple, the operation is convenient, and it can improve the installation efficiency of the nut.

[0015] Furthermore, it also includes a fixing plate, which is connected and fixed to the first slider. The first elastic element can apply a force to the fixing plate in the opposite direction to the movement of the fixing plate. The fixing plate is used to abut against the first elastic element, causing the working part to move in a direction away from the first direction. The setting of the fixing plate can reduce the volume of the first slider, avoid the first slider occupying too much space, and make the overall structure of the tightening device more compact and simple.

[0016] Furthermore, it also includes a baffle plate, which is disposed above the fixed plate and has a preset gap with the fixed plate. The baffle plate can limit the movement distance of the fixed plate and prevent the fixed plate from moving excessively, thereby affecting the descent stroke of the workpiece.

[0017] Furthermore, the fixing plate includes a first fixing plate connected to the first slider and a second fixing plate fixedly connected to the first fixing plate. The second fixing plate has a through hole, and the baffle has a connecting hole corresponding to the through hole. Guide posts are inserted into the through hole and the connecting hole. The guide posts can provide stable guidance when the fixing plate moves, ensuring that the fixing plate slides smoothly in a predetermined direction.

[0018] Furthermore, the driving component is positioned above the baffle and fixedly connected to it. The driving component can drive the baffle to move towards the fixed plate, and in turn, cause the fixed plate to move in the first direction. This ensures that the force applied by the driving component is evenly transmitted to the baffle, avoiding offset problems caused by uneven force distribution.

[0019] Furthermore, the baffle has a connecting plate passing through the fixed plate on the side opposite to the driving member. A connecting block is provided on the connecting plate, and the first elastic member is connected to the connecting block and positioned below the fixed plate. The connecting block ensures the connection stability of the elastic member and improves the overall structural compactness, reducing the size of the device.

[0020] Furthermore, the second elastic element is fixedly connected to the first mounting plate and is located below the fixed plate. During operation, the driving element drives the baffle to move, causing the fixed plate to move in the first direction. The driving element and the second elastic element remain in contact at all times. This allows the second elastic element to apply a uniform counterforce to the driving element, ensuring the stability of the workpiece during movement.

[0021] Furthermore, it also includes a stop assembly, which includes a first stop member fixedly connected to the first mounting plate, a drive cylinder disposed on the first mounting plate, and a second stop member disposed within the drive cylinder. The drive cylinder can drive the second stop member to extend out from the drive cylinder and abut against the first stop member to block the movement of the first mounting plate.

[0022] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0023] This application, by setting a first elastic element and a second elastic element, can balance and reduce the force on the nut during the tightening process. When the nut moves onto the bolt, the first elastic element can buffer the working part, balance the pressure of the working part's own weight on the nut pressing against the bolt, prevent the nut from being damaged when the working part descends, and make pre-positioning for subsequent tightening of the nut. When tightening the nut, the second elastic element can apply a reaction force to the driving part to balance the pressure during the tightening process of the nut, thereby avoiding the nut being damaged by excessive compression.

[0024] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an overall structural diagram of a nut tightening device provided in an embodiment of this application;

[0027] Figure 2 This is a partial structure of a base provided in an embodiment of this application. Figure 1 ;

[0028] Figure 3 This is a partial schematic diagram of a nut tightening device provided in an embodiment of this application from a first angle;

[0029] Figure 4 This is a partial schematic diagram of a nut tightening device provided in an embodiment of this application. Figure 1 ;

[0030] Figure 5 This is a partial schematic diagram of a nut tightening device provided in an embodiment of this application. Figure 2 ;

[0031] Figure 6 This is a partial schematic diagram of a nut tightening device provided in an embodiment of this application. Figure 3 ;

[0032] Figure 7 This is a partial connection diagram of a driving component provided in an embodiment of this application;

[0033] Figure 8 This is a partial schematic diagram of a nut tightening device provided in an embodiment of this application. Figure 4 .

[0034] The reference numerals in the above figures are as follows: 11. Base plate; 12. Support column; 13. Lifting cylinder; 14. Cylinder connecting plate; 2. First mounting plate; 31. First guide rail; 32. First slider; 33. First fixing plate; 34. Second fixing plate; 35. Baffle; 36. Connecting plate; 37. Connecting block; 38. First elastic element; 39. Guide column; 41. First cylinder; 411. First abutment rod; 42. Second cylinder; 421. Second abutment rod; 51. First stop; 52. Drive cylinder; 53. Second stop; 61. Nut detection sensor; 62. Displacement sensor; 7. Working part; 71. Air pipe connector; 72. Suction pipe; 73. Dust suction pipe; 81. Second guide rail; 82. Drive motor; 83. Second mounting plate; 9. Third mounting plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In addition, the accompanying drawings of the present invention are only simple illustrations and are not depictions based on actual dimensions, as stated in advance.

[0036] In this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "forward," "backward," "between," "near," and "farthest" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.

[0038] Reference Figures 1 to 8This application provides a nut tightening device, including a first mounting plate 2, a first guide rail assembly fixed on the first mounting plate 2, a working piece 7 connected to the first guide rail assembly, and a first elastic member 38, a driving member, and a second elastic member. The first mounting plate 2 is liftable, thereby driving the first guide rail assembly and the working piece 7 to rise and fall. The first guide rail assembly includes a first guide rail 31 fixed on the first mounting plate 2 and a first slider 32 disposed on the first guide rail 31. The first elastic member 38 can apply a force opposite to the direction of movement of the first slider 32 to the first slider 32, causing the working piece 7 to descend until the nut and bolt collide. Then, the working piece 7 moves upward along the first guide rail 31 to counteract the pressure exerted by the working piece's own weight on the nut and bolt. The driving member is connected and fixed to the first mounting plate 2 and is configured to drive the first slider 32 to move. The second elastic member is configured to abut against the driving member or the first slider 32, so that when the driving member drives the first slider 32 to move in a first direction, it can apply a reverse force to the driving member or the first slider 32, thereby reducing the thrust during the nut tightening process.

[0039] like Figure 1 and Figure 2 As shown, the nut tightening device in this embodiment also includes a base, which includes a base plate 11 and a support column 12 located below the base plate 11. A lifting cylinder 13 is provided on the base plate 11. The first mounting plate 2 is connected to the lifting cylinder 13. The lifting cylinder 13 can drive the first mounting plate 2 to descend in a first direction.

[0040] The lifting cylinder 13 can move along the length of the base plate 11. Specifically, the base plate 11 is provided with a second guide rail assembly, which includes a second guide rail 81 on the base plate 11, a second slider on the second guide rail 81, and a drive motor 82 that drives the second slider to move along the second guide rail 81. The lifting cylinder 13 is connected to the second slider. During operation, the drive motor 82 drives the second slider to move along the second guide rail 81, thereby moving the lifting cylinder 13 along the base and moving the nut from the position to be picked up to the position to be tightened.

[0041] In this embodiment, the length direction of the base plate 11 is perpendicular to the first direction, the downward direction is the same as the first direction, and the upward direction is opposite to the first direction. Specifically, the length direction of the base plate 11 is the direction indicated by arrow a in the figure, and the first direction is the direction indicated by arrow b.

[0042] In one possible embodiment, the second slider is provided with a second mounting plate 83, and the lifting cylinder 13 is fixedly connected to the second mounting plate 83.

[0043] Optionally, the lifting cylinder 13 is provided with a cylinder connecting plate 14, and the first mounting plate 2 is connected to the cylinder connecting plate 14 and is located on the side of the cylinder connecting plate 14 away from the lifting cylinder 13. When the piston rod of the lifting cylinder 13 moves, it drives the cylinder connecting plate 14 to rise and fall, thereby causing the first mounting plate 2 to rise and fall along the height direction of the base.

[0044] In one possible embodiment, a nut detection sensor 61 is connected to the second mounting plate 83. When the workpiece 7 is at the initial height, the nut detection sensor 61 can detect whether the workpiece 7 is attracted to the nut, thereby determining whether the nut is tightened or attracted.

[0045] The first slider 32 is provided with a fixing plate, which includes a first fixing plate 33 connected to the first slider 32 and a second fixing plate 34 disposed above the first fixing plate 33. The second fixing plate 34 is fixedly connected to the first fixing plate 33.

[0046] In one possible embodiment, the first slider 32 is connected to a third mounting plate 9 on the side opposite to the first mounting plate 2, and the first fixing plate 33 is fixedly connected to the side of the third mounting plate 9. The third mounting plate 9 can move up and down on the first guide rail 31 with the first slider 32 to drive the first fixing plate 33 and the second fixing plate 34 to move.

[0047] To prevent the first mounting plate 2 from moving too far, a baffle 35 is provided above the second fixing plate 34, and a preset gap is provided between the baffle 35 and the second fixing plate 34. The preset gap can be set according to the actual situation, for example, the gap can be set to 1 to 3 mm.

[0048] The second fixing plate 34 is provided with a through hole, and the baffle 35 is provided with a connecting hole corresponding to the through hole. A guide post 39 is inserted into the through hole and the connecting hole. When the fixing plate moves toward the baffle 35, the guide post 39 can guide it.

[0049] The working principle of the first elastic element 38 is as follows: when the working part 7 moves above the bolt to be tightened through the second guide rail assembly, the lifting cylinder 13 drives the first mounting plate 2 to descend along the first direction until it contacts the nut and bolt. At the same time, the first fixing plate 33, under the action of the first elastic element 38, drives the third mounting plate 9 to move upward, so that the third mounting plate 9 drives the working part 7 to rise, thereby buffering the contact force between the nut and bolt in the working part 7 to avoid damage to the nut or bolt.

[0050] In this embodiment, the first elastic element 38 is disposed below the fixing plate. Specifically, as shown... Figure 7As shown, the fixed plate has a through hole, and the side of the baffle 35 away from the drive member has a connecting plate 36 that passes through the through hole. The connecting plate 36 has a connecting block 37. The first elastic member 38 is connected to the connecting block 37 and is thus located below the second fixed plate 34. When the fixed plate descends due to the gravity inertia of the working member 7, the fixed plate presses against the first elastic member 38. The first elastic member 38 applies an upward elastic force to the fixed plate, causing the fixed plate to move upward.

[0051] In another possible embodiment, the fixing plate is located below and connected to the first elastic member 38. When the fixing plate descends due to the gravity inertia of the working piece 7, the first elastic member 38 applies a pulling force to the fixing plate, and the pulling force rebounds, causing the fixing plate to move upward.

[0052] In one possible embodiment, the driving component is a first cylinder 41, which is located above the baffle 35 and fixedly connected to the baffle 35. The first cylinder 41 is provided with a first abutting rod 411 that passes through the baffle 35 and the fixed plate. When the first cylinder 41 is working, the first abutting rod 411 abuts against the second elastic member and drives the baffle 35 to move toward the fixed plate, thereby driving the fixed plate to move toward the first direction.

[0053] The second elastic element is fixedly connected to the first mounting plate 2. In one possible embodiment, the second elastic element is a second cylinder 42, which is located below the fixed plate. The second cylinder 42 is provided with a second abutting rod 421. When the second cylinder is working, the second abutting rod 421 abuts against the first abutting rod 411. While maintaining the abutting state, the second abutting rod 421 retracts towards the direction close to the second cylinder 42, and the first abutting rod 411 extends in a first direction under the drive of the first cylinder 41.

[0054] The specific working principle is as follows: In the initial state, the first cylinder 41 provides downward pressing power, and the second cylinder 42 provides upward thrust. When it is necessary to tighten the nut, the first cylinder 41 drives the baffle 35 to press down, so that it abuts against the second fixed plate 34, which in turn drives the second fixed plate 34 to descend, thereby driving the third mounting plate 9 to descend so that the nut and bolt in the working part 7 come into contact. At the same time, the second abutting rod 421 of the second cylinder 42 retracts, and the first abutting rod 411 of the first cylinder 41 continues to press down towards the second cylinder 42. During the retraction process of the second cylinder 42, it still provides upward thrust, so that the first abutting rod 411 and the second abutting rod 421 remain in abutting state to counteract part of the downward pressing power of the first cylinder 41, so that the nut moves with a small thrust during the tightening process, thereby avoiding damage to the nut or bolt.

[0055] In one possible embodiment, the nut tightening device further includes a stop assembly, which comprises a first stop 51 fixedly connected to the first mounting plate 2, a drive cylinder 52 disposed on the first mounting plate 2, and a second stop 53 disposed within the drive cylinder 52. The drive cylinder 52 can drive the second stop 53 to extend from within the drive cylinder 52 and abut against the first stop 51 to block the movement of the first mounting plate 2. The purpose of limiting the movement of the working piece 7 by the stopping action of the first stop 51 and the second stop 52 is to avoid setting multiple strokes through a single cylinder. If only one cylinder is used, the cylinder needs to pause its stroke when tightening bolts at different heights, and such a cylinder is costly. Therefore, this application uses different cylinders to drive the working piece 7 to descend to different heights to match bolts of different sizes, and the structure is simple and low-cost.

[0056] The specific working principle is as follows: When the length of the bolt to be tightened is different, the height to which the working part 7 descends will also be different. The working part 7 is preset to descend to a first height and a second height, with the first height being less than the second height. When the bolt to be tightened is at the first height, the drive cylinder 52 does not work, the second stop 53 is located inside the drive cylinder 52, and the lifting cylinder 13 drives the working part 7 to descend to the first height to tighten the nut at that position. When the bolt to be tightened is at the second height, the drive cylinder 52 drives the second stop 53 to extend. When the lifting cylinder 13 drives the first mounting plate 2 to descend, the second stop 53 abuts against the first stop 51, preventing the first mounting plate 2 from descending further, so that the working part 7 is kept at the second height position to tighten the nut at that position.

[0057] In one possible embodiment, the nut tightening device is further provided with a displacement sensor 62 connected to the first mounting plate 2. The displacement sensor 62 can monitor the descent stroke of the working piece 7, thereby realizing monitoring during the nut installation process and reducing equipment investment and labor costs.

[0058] In this embodiment, the working part 7 is a screwdriver, and the working part 7 is equipped with an air intake assembly. The air intake assembly includes an air pipe connector 71, an air suction pipe 72 with one end connected to the air pipe connector 71 and the other end connected to the outside, and a dust suction pipe 73 with one end connected to the air pipe connector 71 and the other end connected to the outside. The working principle of the screwdriver in adsorbing and tightening bolts and nuts is the same as that of the prior art, and will not be described in detail here.

[0059] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A nut tightening device, characterized by, include: First mounting plate, the first mounting plate is liftable; The first guide rail assembly includes a first guide rail fixed to the first mounting plate and a first slider disposed on the first guide rail; The working part is connected and fixed to the first slider; A fixing plate is connected and fixed to the first slider; A driving component, which is connected and fixed to the first mounting plate and configured to drive the first slider to move; A baffle is provided above the fixed plate and has a preset gap with the fixed plate. A driving member is provided above the baffle and is fixedly connected to the baffle. The driving member can drive the baffle to move toward the fixed plate and drive the fixed plate to move toward a first direction. A connecting plate passing through the fixed plate is provided on the side of the baffle away from the driving member. A connecting block is provided on the connecting plate. A first elastic element is connected to the connecting block and is disposed below the fixed plate. The first elastic element can apply a force to the fixed plate that is opposite to the direction of movement of the fixed plate. The second elastic element is fixedly connected to the first mounting plate and is located below the fixed plate. During operation, the driving element drives the baffle to move and causes the fixed plate to move in the first direction. The driving element and the second elastic element are always in contact, so that when the driving element drives the first slider to move in the first direction, a reverse force can be applied to the driving element.

2. The nut tightening device according to claim 1, characterized in that, It also includes a base, on which a lifting cylinder is provided. The lifting cylinder can move along the length of the base. The first mounting plate is connected to the lifting cylinder, and the lifting cylinder can drive the first mounting plate to descend along a first direction.

3. A nut tightening device according to claim 2, characterized in that, It also includes a second guide rail assembly, which includes a second guide rail fixed on the base, a second slider disposed on the second guide rail, a drive motor for driving the second slider to move along the second guide rail, and a second mounting plate connected to the second slider. The lifting cylinder is fixedly connected to the second mounting plate.

4. A nut tightening device according to claim 1, characterized in that, The fixing plate includes a first fixing plate connected to the first slider and a second fixing plate fixedly connected to the first fixing plate. The second fixing plate is provided with a through hole, and the baffle is provided with a connecting hole corresponding to the through hole. Guide posts are inserted through the through hole and the connecting hole.

5. A nut tightening device according to claim 1, characterized in that, It also includes a stop assembly, which includes a first stop member fixedly connected to the first mounting plate, a drive cylinder disposed on the first mounting plate, and a second stop member disposed within the drive cylinder. The drive cylinder can drive the second stop member to extend out from the drive cylinder and abut against the first stop member to block the movement of the first mounting plate.

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